This document lists and describes design changes of the European XFEL with respect to the Technical Design Report (TDR), points out regions or components which are worked out and documented in much more detail than in the TDR and, finally, gives an overview of possible upgrades which are presently discussed.
From this page, you can download the technical design report of the European XFEL facility in pdf format.
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For your convenience the TDR is also provided in separate files for each chapter: